Publications
Products (journal articles, reports, fact sheets) authored by current and past scientists are listed below. Please check the USGS Pubs Warehouse for other USGS publications.
Filter Total Items: 1939
Microbial sulfate reduction and the sulfur budget for a complete section of altered oceanic basalts, IODP Hole 1256D (eastern Pacific) Microbial sulfate reduction and the sulfur budget for a complete section of altered oceanic basalts, IODP Hole 1256D (eastern Pacific)
Sulfide mineralogy and the contents and isotope compositions of sulfur were analyzed in a complete oceanic volcanic section from IODP Hole 1256D in the eastern Pacific, in order to investigate the role of microbes and their effect on the sulfur budget in altered upper oceanic crust. Basalts in the 800m thick volcanic section are affected by a pervasive low-temperature background...
Authors
Jeffrey C. Alt, Wayne C. Shanks
Effects of intrusions on grades and contents of gold and other metals in volcanogenic massive sulfide deposits Effects of intrusions on grades and contents of gold and other metals in volcanogenic massive sulfide deposits
The reason some VMS deposits contain more gold or other metals than others might be due to the influence of intrusions. A new approach examining this possibility is based on examining the information about many VMS deposits to test statistically if those with associated intrusions have significantly different grades or amounts of metals. A set of 632 VMS deposits with reported grades...
Authors
Donald A. Singer, Vladimir Berger, Dan L. Mosier
Search for and limits on plume activity on Mimas, Tethys, and Dione with the Cassini Visual Infrared Mapping Spectrometer (VIMS) Search for and limits on plume activity on Mimas, Tethys, and Dione with the Cassini Visual Infrared Mapping Spectrometer (VIMS)
Cassini Visual Infrared Mapping Spectrometer (VIMS) observations of Mimas, Tethys, and Dione obtained during the nominal and extended missions at large solar phase angles were analyzed to search for plume activity. No forward scattered peaks in the solar phase curves of these satellites were detected. The upper limit on water vapor production for Mimas and Tethys is one order of...
Authors
B. J. Buratti, S.P. Faulk, J. Mosher, K. H. Baines, R. H. Brown, Randal C. Clark, P. D. Nicholson
Mineralogic sources of metals in leachates from the weathering of sedex, massive sulfide, and vein deposit mining wastes Mineralogic sources of metals in leachates from the weathering of sedex, massive sulfide, and vein deposit mining wastes
Weathered mine waste consists of oxidized primary minerals and chemically unstable secondary phases that can be sources of readily soluble metals and acid rock drainage. Elevated concentrations of metals such as Cd, Cu, Fe, Mn, Ni, Pb, and Zn are observed in deionized water-based leachate solutions derived from complex sedex and Cu-Pb-Zn mine wastes. Leachate (USGS FLT) from the...
Authors
S. F. Diehl, P. L. Hageman, R.R. Seal, N.M. Piatak, H. Lowers
Mapping permeability over the surface of the Earth Mapping permeability over the surface of the Earth
Permeability, the ease of fluid flow through porous rocks and soils, is a fundamental but often poorly quantified component in the analysis of regional‐scale water fluxes. Permeability is difficult to quantify because it varies over more than 13 orders of magnitude and is heterogeneous and dependent on flow direction. Indeed, at the regional scale, maps of permeability only exist for...
Authors
T. Gleeson, L. Smith, N. Moosdorf, J. Hartmann, H.H. Durr, Andrew H. Manning, L. P. H. Van Beek, A. Mark Jellinek
Hapke modeling of Rhea surface properties through Cassini-VIMS spectra Hapke modeling of Rhea surface properties through Cassini-VIMS spectra
TThe surface properties of the icy bodies in the saturnian system have been investigated by means of the Cassini-VIMS (Visual Infrared Mapping Spectrometer) hyperspectral imager which operates in the 0.35–5.1 μm wavelength range. In particular, we have analyzed 111 full disk hyperspectral images of Rhea ranging in solar phase between 0.08° and 109.8°. These data have been previously...
Authors
M. Ciarniello, F. Capaccioni, G. Filacchione, Roger N. Clark, D. P. Cruikshank, P. Cerroni, A. Coradini, R. H. Brown, B. J. Buratti, F. Tosi, K. Stephan
Organic sedimentary deposits in Titan's dry lakebeds: Probable evaporite Organic sedimentary deposits in Titan's dry lakebeds: Probable evaporite
We report the discovery of organic sedimentary deposits at the bottom of dry lakebeds near Titan’s north pole in observations from the Cassini Visual and Infrared Mapping Spectrometer (VIMS). We show evidence that the deposits are evaporitic, making Titan just the third known planetary body with evaporitic processes after Earth and Mars, and is the first that uses a solvent other than...
Authors
J. W. Barnes, J. Bow, J. Schwartz, R. H. Brown, J.M. Soderblom, A. G. Hayes, G. Vixie, S. Le Mouelic, S. Rodriguez, Christophe Sotin, R. Jaumann, K. Stephan, L.A. Soderblom, Roger N. Clark, B. J. Buratti, K. H. Baines, P. D. Nicholson
Mountain-block recharge, present and past, in the eastern Espanola Basin, New Mexico, USA Mountain-block recharge, present and past, in the eastern Espanola Basin, New Mexico, USA
Noble gas recharge temperatures (NGTs) and radiocarbon ages were determined for 43 groundwater samples collected in the eastern Española Basin, New Mexico (USA), to identify mountain-block recharge in waters
Authors
Andrew H. Manning
A lognormal distribution of metal resources A lognormal distribution of metal resources
For national or global resource estimation of frequencies of metals, a lognormal distribution has commonly been recommended but not adequately tested. Tests of frequencies of Cu, Zn, Pb, Ag, and Au contents of 1 984 well-explored mineral deposits display a poor fit to the lognormal distribution. When the same metals plus Mo, Co, Nb2O3, and REE2O3 are grouped into 19 geologically defined...
Authors
Donald A. Singer